Caption: Skylab SL-2 (SLM-1) astronaut Paul Weitz looks into the camera as he makes an adjustment and sets it going in the work and experiments area of the Orbital Workshop crew quarters. He floats away towards the far wall and the restroom area - doing a somersault as he flies across the room. In the compartment next to him Joseph Kerwin (nearest camera) and Pete Conrad (behind him) prepare for a session in the Negative Body Pressure Device. Next door Weitz takes a flannel and wipes it over his hair and face before coming back towards the centre of the room and adjusting a piece of fabric. He returns to the restroom. Kerwin attaches something to Conrad's back and the pair float out again to the centre of the room. Conrad inserts himself from the waist down into the Lowe Body Negative Pressure Device (LBPD) whilst Kerwin makes adjustments to it at the foot end. Only Conrad's bare torso and chest are showing. He reclines putting his hands behind his head. The LBNPD Experiment was used to investigate how long it took for the human body's cardiovascular system to adapt to space flight. Results were used to provide in flight data for predicting the degree of orthostatic intolerance and for predicting how impaired an astronaut's physical capacity was likely to be upon return to Earth.